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The specs say:

Admittance shall be by means of a locked door and/or key operated switch, which in order to provide compatibility within Local Authorities, shall be a Yale Key, 10½ Section, change 900. Access to level 1 facilities shall be gained without opening the main controller door(s).

What exactly is the meaning of the bolded section? I guess it defines some kind of key (and associated lock), but how do I read it? How can I even begin searching for a lock fulfilling these specs?

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    $\begingroup$ Yale is a manufacturer of locks. You should ask them what the rest of it means. $\endgroup$
    – Dave Tweed
    Apr 12 '16 at 19:19
  • $\begingroup$ @DaveTweed: Generally, Yale type lock is not necessarily manufactured by Yale. You have various types like Mortise, Warded, Wafer tumbler, Tubular locks - and Pin tumbler locks, AKA Yale type locks. Although I bet guys at Yale should know. $\endgroup$
    – SF.
    Apr 13 '16 at 0:32
  • $\begingroup$ K900 is the cutting punch but I suspect "change900" refers to the number of bitting combinations. some info at lsamichigan.org/Tech/… $\endgroup$ Apr 13 '16 at 13:02
  • $\begingroup$ Is this from the TOPAS UK-traffic signal controller? That one says "Yale Key Type 900" topasgroup.org.uk/MyFiles/Files/specifications/… However, given the complete lack of hits elsewhere on the web, I suspect this is a spec that's been copied for at least 15 years from previous documents without anyone checking to see whether it makes sense. $\endgroup$ Apr 13 '16 at 13:12
  • $\begingroup$ @CarlWitthoft: It's that document, though the source was different. I agree, at the time of its writing the idea of touchscreen devices with network access was alien to the authors. We're in the process of estimating costs of adapting our controller to UK specs; things like how much work will be needed to cripple the fine-grained security into the 5 levels required, or how to constrict the versatile access methods to "on-site terminal only"... $\endgroup$
    – SF.
    Apr 14 '16 at 2:31

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